SLK32 AMG vs. SLK320

Hello! All those who know a little about the above vehicles. I would be interested in the differences in the maintenance costs between these two models. I count – inspections in the Mercedes branch – wear part costs (brakes, exhaust, etc.) – Other AMG-specific spare parts costs (motor parts) In terms of fuel consumption the two do not seem to differ greatly. Will the compressor of the AMG be connected via a coupling if necessary? A 32 AMG with acceptable mileage (max. 75,000km) is available for about 25,000€. Does the engine have any known weakness or is it much more vulnerable than the simple suction version? What about the durability and running performance of this machine? Should you set aside a thick extra budget for maintenance when purchasing an AMG? Would you like to receive competent answers?